So, there are at least 2 bosses in the game(correct me, if I am wrong, I will find and kill other bosses too) that show some sort of challenge, but do not have a drop. And if Watcher is kinda simple, Buley takes me 10 minutes to kill him without casualties.
And then one but. They do not have a single drop. It's very nice that they gave me exp, but in that stage, I am already at max exp, so it makes them pointless. How about some unique items for that victories?